Improvement in dental pluggers



E; T. STARR.

Dental-Hugger.

Patented Aug. 31.1875.

.N @EN INVENTOR.

WI TJV ESSES NV PETERS, 'PHDT01LITHOGRAPHEE WASHINGTON. D C.

ELl T. STARR, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SAMUEL S. WHITE, OF SAME PLACE.

IMPROVEMENT IN DENTAL PLUGGERS.

Specication forming part of Letters Patent No. 167,203, dated August 31, 1875 application filed July 12, 1875.

Oasi; E.

Toall whom it may concern:

Be it known that I, ELI T. STARR, of the city and county of Philadelphia, in the Statematic pluggers for dentists7 use, in which a hammer, retracted and released at intervals by a cam or its equivalent, is thrown forward by a spring to give the blow. Its object is to enable the operator, at will, to throw the mallet out of operation without stopping the driving mechanism; to which end my improvement consists in the combination of a reciprocating' mallet; a spring-hook on the mallet engaging with the cam or wiper by which the lnallet is retracted; a trip-wedge or disengag'ing-incline, by which the spring-hook is, at the proper moment, released from the stud or cam; and a spring' which actua-tes the mallet in giving the blow.

In the accompanying drawings my improvements are shown as applied to the tooth-plug'h g'er for which Letters Patent of the United States, No. 142,205, were granted August 26, 1873, to Thomas L. Buckingham.

Figure l represents a longitudinal section throug'h the plugger parallel with the face of the cam or wiper wheel, and Fig. 2 a similar section at right angles thereto.

The flexible shaft A drives a worm, a, which rotates a gear wheel, B, having spuds or wipers b onone of its faces. These parts are mounted in a casing, O, having a reciprocating spring plugger-point, l), and a mallet, E, inclosed therein. A spring-hook, e, on the ma-llet, engages with one of the wipers abovementioned, and is retracted until its end slides over an incline, f, which releases the hook from the wiper, and allows the mallet to be thrown forward by its spring E.

These parts are all shown in the patent of Buckingham aforesaid, and are not claimed herein per se, but the Buckingham plugg'er could not be stopped wit-hout stopping' the rotation of the driving-worm.

To enable the operator to throw the plugg'er out of action whenever desired without stopping' the driving mechanism I form a longitudinal slot in the casing' and in the head ofthe mallet, and insert th'erein a pin, t', which passes through a sleeve, I, capable of moving' freely endwise on the casing. By retracting' this slide away from the plugger-point the spring-hook e is forced upon the incline and held out of contact with the wipers, conse-` quently holding the mallet inoperative; but the moment the sleeve is released the parts are thrown into gear again by the malletspring, and the operation is resumed. The operator is thus enabled instantaneously to stop or start the instrument without removing' his hand therefrom.

I am aware that automatic pluggers heretofore have been thrown out of action by tripping' mechanism mounted upon the instrument itself', and therefore do not broadly claim every mode of obtaining' this result.

What I claim as of my own invention, and desire to secure by Letters Patent, is-

The combination, substantially as hereinbefore set forth, of the wiper-wheel, the springhook on the mallet, the disengaging-incline, the mallet-spring, and the sliding sleeve, whereby the spring-hook is held out of contact with the wiper when retracted by the slide, and automatically thrown into action by releasing it.

In testimony whereof I have hereunto subscribed my name.

ELI T. STARR. 

